Removing the Dev channel restriction for requestBody of Web Request API.

The 'requestBody' feature of the Web Request API has now been some time in Dev
and Canary channels. It has been used by extension developers, as documented on
the associated bug, and on
https://chrome.google.com/webstore/detail/observepoint-tag-debugger/daejfbkjipkgidckemjjafiomfeabemo .


BUG=91191
TBR=mpcomplete@chromium.org

Review URL: https://chromiumcodereview.appspot.com/12077029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179147 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed